News organizations cultivate a reputation for demanding transparency, whether by suing for access to government documents, dispatching camera crews to the doorsteps of recalcitrant politicians, or editorializing in favor of open government.

But now many of the country's biggest media companies — which own dozens of newspapers and TV news operations — are flexing their muscle in Washington in a fight against a government initiative to increase transparency of political spending.

The corporate owners or sister companies of some of the biggest names in journalism — NBC News, ABC News, Fox News, the Washington Post, the Wall Street Journal, USA Today, Politico, the Atlanta Journal-Constitution, and dozens of local TV news outlets — are lobbying against a Federal Communications Commission measure to require broadcasters to post political ad data on the Internet.